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Structure-Activity Relationship of Some New Anti-Arrhythmic Phenytoin Derivatives

✍ Scribed by Maria Ciechanowicz-Rutkowska; Katarzyna Stadnicka; Katarzyna Kiec-Kononowicz; Hanna Byrtus; Barbara Filipek; Malgorzata Zygmunt; Dorota Macia̧g

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
265 KB
Volume
333
Category
Article
ISSN
0365-6233

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✦ Synopsis

The pharmacological activity of nine anti-arrhythmic phenytoin derivatives was assessed in preventing chloroform-induced arrhythmia. The compounds were tested in vitro on isolated heart of the rat. Four compounds were chosen as representative of the spatial characteristics of the studied group, and X-ray structure analyses were carried out on them. Because the protonated form is present in physiological milieu, conformational analysis was performed on the protonated form of the four representatives and in addition on the compound showing the highest anti-arrhythmic activity. It was found that substitution of the imidazolidinone ring of phenytoin at position 3 by a chain containing a tertiary amine nitrogen atom changes the affinity profile from inactivated (phenytoin-like) to activated (quinidine-like) cardiac sodium channels. The activity of the studied compounds relies on the presence of protonated tertiary nitrogen atom, at least one phenyl ring, and flexibility of the molecule, which enables the spacer to assume a desired length.

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